Tube



June 17,- 19 1. MB'RUUN 2,246,123

TuBla' Filed Aug. 6, 1938 Patented June 1 7, 1 941 Application August 6, 1938, Serial No. 223,462 I In Germany August 20, 1937 4 Claims. (Cl. 221-60) The invention relates to an improved metal tube of the kind serving as a receptaclefor tooth paste, shaving cream, other cosmetic preparations and the like.

Such tubes consist of a cylindrical tube with a shoulder 'partand a threaded neck. For cosmetic preparations the tubes are preferably made from nearly pure tin, owing to the great softness of this material and its considerable ability to resist chemical attacks.

On account of the relatively high price of the pure tin, tubes of lead with a coating of tin are used as a substitute for tin tubes.

The invention relates to tubes of this kind, and

has'for its objects first to build up the tube in such a manner that the lead core of the tube is covered entirely by tin, especially near or at the neck, second to secure full tightness between a v neck made of pure or nearly pure tin and the rest of the tube, made of tinned lead. The tubes are manufactured from a circular metal blank by drawing in a press, in one coherent piece. In the manufacture of tin tubes, the initial stage is a blank of tin, and in the manufacture of tinned lead tubes a blank of tinned lead is used. During the drawing of the latter, the tin surface of the blank follows the drawing operation and forms, thereafter, a coating of tin on the finished tube. By a sufliciently heavy tinning of the blank it is feasible, in this manner, to attain a satisfactory tinning of the outer as well as the inner surface of the .finished tube. After the drawing follows the cutting or pressing of the thread on the neck. By the finishing of the latter as well as by the requisite fixation of the tube duringthese processes some damage to the thin coating of tin, on the inside as well as on the outside of the neck of the tube, cannot'be avoided, whereby the lead becomes visible at certain points. Suchan exposure of the-lead is very undesirable, especiallylon the neck, because the chemical action of the contents of the tube is here increased by the access of atmospheric air, in such a manner that the contents will be attacked by the lead, and thereby will be spoiled, while the appearance of the tube will be impaired.

For this reason, tinned lead tubes have not been useful as containers for alkaline tooth cream or shaving cream, nor for other substances witlra pronounced chemicalreaction.

' In order to remedy this drawback, it has-been attempted to manufacture the tube .from two separate parts, one of which forms the cylindrical tube and the shoulder, and the other one the neck, .the latter being then made from pure tin, synthetic press substance or other material.

The joining together of the two parts has heretofore been eifected-by mechanical pressing, folding, screwing or bending. By this procedure, however, it is impossible to' avoid injury to the thin tin surface, nor has it been possible in this manner to attain perfect tightness between the assembled parts. The liquid part of the contents of the tube, for instance water and etheric oils,

will therefor have a chance to ooze through the unavoidable joints and to evaporate.

In necks of tinned lead tubes produced by drawing as one coherent piece, it has further been attempted to press a tin tube, and to fix the same in the neck by flanging the edge. In this method,

however, similar drawbacks appear as those mentioned above, and the exterior of the neck is still exposed to attacks from the tube contents, as the lead is here exposed in the thread, and will come into contact with the tube contents, when the closing cap hood of the tube is being screwed on and oil.

It is also known to make the neck from artificial resin or the like, and to join the same with the .shoulder part of the tube by pressing. In this method an internal injury to the tinning is unavoidable, and owing to the physical differences of the materials used it is impossible to secure a perfect/tightness between the parts, especially in the case of great temperature variations.

Finally, it is also known to use tubes made from Cellophane or the like with a neck of a similar material attached tothe shoulder of the tube by means of adhesive substances. By this process,

one runs the risk that the tube contents may attack the adhesive substance, so that the connection between the shoulder part and the neck may become loosened. 4 a

Tubes of this kind have therefore only a limited,

, field of usefulness.

, It has also been attempted, unsuccessfully, to manufacture tubes in one coherent piece, the cylindrical part and the shoulder being of tinned lead, and the neck of the tube being of pure tin formed by the drawing of a blank of tinned lead, 'in which the part that after the drawing was to form the neck of the tube consisted of a core of pure tin.

In order to attain the objects of the invention, these two pieces are assembled by fusing. In this manner the two parts are joined so as to form a. finished tube, without the tin coating sufiering any mechanical injury, and by the fusion the two der part of tinned lead, and

' so as to form-a coherent tube, as

parts are joined securely and perfectly tight against impact of air and liquid..

The fusion of the two parts may be efieeted with or without the use of soldering metal, flux or the like. The fusion may also be-effected in that the neck is formed by casting from molten tin at the same time as the neck is fused to the shoulder part of the tube. Theterms fusion and to fuse are used in the specification and claimsin their natural broad sense. These terms are intendedto cover soldering and similar processes involving the application of heat in order to melt metal and join two metal bodies together.

The drawing represents various tubes and tube parts. in axial section.

Fig. 1 shows an ordinary tube in one coherent piece, made from tinned lead,

Fig. 2 a tube neck produced separately from solid tin,

Fig. 3 a separately produced tube and shoul- Figs. 4 to 7 four different constructions of tubes made by fusing a neck to a tube and shoulder part;

In the construction shown in Fig. 1 of an ordinary tube made from tinned lead in one piece, the tinning is indicated by a heavy line. The tinning covers, as shown, the tubular part I of the tube, the shoulder part2 and the inner face of the neck 3, but is removed, during the manufactureof the tube, by the cutting of the thread 4 on the outer face of the neck and by the finishing cut on the end face 5 of the neck. At these places, the lead is thereforelaid bare, and is ex-. posed to attacks from the tube contents and the air.

This drawback is avoided by making the tube from two separate parts, viz. a neck 6 of solid tin, as shown in Fig. 2, and of a tube and shoulder part I, as shown in Fig. 3, which part is made from tinned lead. This tube and shoulder part 1 has an end face 8 in which the lead is bare but,

according to the invention, 1y by the neck 6 by fusion is covered completeof the parts 6 and 1, shown .in Figs. 4 to '1, in which the fusing is effected along the assembling surface 9.

The neck 6 may be fused to the tube and shoulder part I simultaneously with the manufacture of the neck, which may a mould disposed on the 1, in such a manner that be formed by casting in the casting of the neck and the fusion are effected at one and the same time.

As appearing from Figs. 4 to 7, the end surface 8 is covered entirely, accordingly to the invention, by the neck 6 made from tin, in such a manner that the end surface 8 is covered towards the inside as well as towards the outside.

I claim! tube and shoulder part- 1. A collapsible tube consisting of a tubular body of lead provided with an inside and outside coat of tin, said body being provided with a shoulder forming an opening of reduced diameter, the lead of said body being exposed alongthe edge of the body surrounding said opening, a nozzle provided with a flange, said flanged nozzle consisting of tin, said nozzle being fused to the tin coat on the shoulder of said body, said nozzle projecting through said opening, whereby contact between. the goods contained in the tube and said exposed lead is avoided.

2. A composite collapsible tube as a substitute for an all tin tube, which comprises a tubular body of lead, one open end of said tubular body being turned inwardly and forming an opening of reduced diameter, the inwardly turned part of the body forming a shoulder, said body being provided with a continuous tin coat on the inside thereof, the lead of said body being exposed along the edge of said shoulder, a nozzle provided with a flange, said flanged nozzle consisting of tin, said flange of the nozzle being fused to the tin coat on said shoulder of the body, said nozzle projecting through said opening, whereby contact between goods contained in the collapsible tube and said exposed lead is avoided.

3. A composite collapsible tube as a substitute for an all tin tube, which comprises a tubular body of lead, one open end of said'body being turned inwardly and forming a shoulder, said body being provided with a continuous tin coat, the lead of said body being exposed along the free edge of said shoulder, a nozzle provided with a flange, said flanged nozzle consisting of tin, said flange of the nozzle be ng fused to said'tin coat on said shoulder, and said exposed lead edge being in close abutment with said nozzle, said continuous coat of tin and the tin nizzle fused thereto forming an uninterrupted tin container, whereby said exposed lead edge is concealed and contamination by the lead is prevented.

.4. A composite collapsible tube as a substitute for an all one-metal tube, which comprises a tubular body consisting of a first metal, one open end of said body being turned inwardly and forming a shoulder, said body being provided with a continuous layer of a second metal, the first metal being exposed along the free edge of said shoulder, a nozzle provided with a flange, said flanged nozzle consisting of the second metal, said flange of the nozzle being fused to said layer on said shoulder, and said exposed edge ofthe first metal being in close abutment with said nozzle, said continuous layer and the nozzle fused thereto forming an uninterrupted container of the second metal, whereby said ex- 

